evaluation of the reduced dentin etching time using universal adhesives in the quality of cervical lesions restorations

Conditions: Non-carious Cervical Lesions

Summary: the aim of this study will be to evaluate the effect of reduced dentin etching time on the 6- and 12-months clinical performance of two universal adhesive systems used as etch-and-rinse application mode in non-carious cervical lesions (nccls). materials \& methods: 140 restorations will be randomly placed in 35 subjects according to the following groups: sup5 (scotchbond universal plus adhesive on dentin etched for 5 seconds); sup15 (scotchbond universal plus adhesive on dentin etched for 15 seconds); gbu5 (gluma universal bond adhesive on dentin etched for 5 seconds); gbu15 (gluma universal bond adhesive on dentin etched for 15 seconds). all groups will be light-cured for 10s/1,000 mw/cm2. a resin composite will be placed by applying three increments and each one will be light cured for 20s/1,000 mw/cm2. the restorations will be finished immediately with fine diamond burs and polishers. the restorations will be evaluated at baseline and after 6- and 12-months by using the fdi criteria. the following outcomes will be evaluated: retention, marginal staining, marginal adaptation, post-operative sensitivity and recurrence of caries. the differences among the groups will be calculated using friedman repeated measures analysis of variance rank (α = 0.05).

this is a four-arm, double-blind, randomized controlled clinical trial. experimental group 1: 35 non-carious cervical lesions (nccl) will receive composite resin restorations using an universal adhesive (scotchbond universal plus; 3m) on dentin etched for 5 seconds in the etch-and-rinse application strategy. experimental group 2: 35 non-carious cervical lesions (nccl) will receive composite resin restorations using an universal adhesive (gluma universal bond; kulzer) on dentin etched for 5 seconds in the etch-and-rinse application strategy. control group 1: 35 non-carious cervical lesions (nccl) will receive composite resin restorations using an universal adhesive (scotchbond universal plus; 3m) on dentin etched for 15 seconds in the etch-and-rinse application strategy. control group 2: 35 non-carious cervical lesions (nccl) will receive composite resin restorations using an universal adhesive (gluma universal bond; kulzer) on dentin etched for 15 seconds in the etch-and-rinse application strategy. lcncs will be randomized to universal adhesive usage and dentin etching time. all groups will be light-cured with a lightcuring device (smartlite focus, dentsply) with a light intensity of 900 mw/cm² for 10 seconds. operators will restore the cervical area by applying three increments of resin (vittra aps, fgm prod. odont.ltda, joinville, sc, brazil). each increment will light cure for 20 s at 900 mw/cm2 (smartlite focus, dentsply). restorations will be finished immediately with fine and extra fine diamond burs and polished with polishing gums.

Eligibility criteria:
inclusion criteria: * patients older than 18 years. * presence of at least two non-carious cervical lesions in the dental arch with a need for restorative treatment. * acceptable level of oral hygiene according to the simplified oral hygiene index. * at least 20 teeth in function. * non-carious cervical lesions with a maximum of 50% of enamel margin. exclusion criteria: * driving difficulties that prevent adequate oral hygiene. * periodontal disease. * active caries lesions on the teeth included in the research. * parafunctional habits. * active staples of removable partial dentures on the teeth included in the research and that these are not pillars of prostheses.

Keywords: dental bonding tooth erosion tooth wear adhesive systems etching time